#!/usr/bin/env python3
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"""Script to check whether a file contains tabs"""

import argparse
import sys
from pathlib import Path
from typing import Sequence

SUPPORTED_ENCODINGS = ("ascii", "utf-8")


def main(argv: Sequence[str] | None = None) -> int:
    """Tabs are not allowed"""
    parser = argparse.ArgumentParser()
    parser.add_argument("files", nargs="*", help="Files to check")
    args = parser.parse_args(argv)
    err = 0
    # pylint: disable-next=too-many-nested-blocks
    for i in [Path(i) for i in args.files]:
        if tabs := i.read_bytes().count(b"\t"):
            for encoding in SUPPORTED_ENCODINGS:
                try:
                    for n, line in enumerate(
                        i.read_text(encoding=encoding).splitlines()
                    ):
                        if "\t" in line:
                            msg = f"{i.absolute().as_posix()}:{n + 1} contains tabs."
                            print(msg, file=sys.stderr)
                    break
                except ValueError:
                    pass
            print(f"{i.absolute().as_posix()} contains tabs.", file=sys.stderr)
        err += tabs
    return min(err, 255)


if __name__ == "__main__":
    raise SystemExit(main())
